diff --git a/Machines/Atari/ST/AtariST.cpp b/Machines/Atari/ST/AtariST.cpp
index 413b94acb..e3683e4d1 100644
--- a/Machines/Atari/ST/AtariST.cpp
+++ b/Machines/Atari/ST/AtariST.cpp
@@ -71,7 +71,8 @@ class ConcreteMachine:
 			Memory::Fuzz(ram_);
 
 			std::vector<ROMMachine::ROM> rom_descriptions = {
-				{"AtariST", "the TOS ROM", "tos100.img", 192*1024, 0x1a586c64}
+//				{"AtariST", "the UK TOS 1.00 ROM", "tos100.img", 192*1024, 0x1a586c64}
+				{"AtariST", "the UK TOS 1.04 ROM", "tos104.img", 192*1024, 0xa50d1d43}
 			};
 			const auto roms = rom_fetcher(rom_descriptions);
 			if(!roms[0]) {
diff --git a/OSBindings/Mac/Clock Signal.xcodeproj/xcshareddata/xcschemes/Clock Signal.xcscheme b/OSBindings/Mac/Clock Signal.xcodeproj/xcshareddata/xcschemes/Clock Signal.xcscheme
index 47f9c7286..1465a4f62 100644
--- a/OSBindings/Mac/Clock Signal.xcodeproj/xcshareddata/xcschemes/Clock Signal.xcscheme	
+++ b/OSBindings/Mac/Clock Signal.xcodeproj/xcshareddata/xcschemes/Clock Signal.xcscheme	
@@ -67,7 +67,7 @@
       </Testables>
    </TestAction>
    <LaunchAction
-      buildConfiguration = "Debug"
+      buildConfiguration = "Release"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
       enableASanStackUseAfterReturn = "YES"